#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <ws2tcpip.h>

// #pragma comment(lib, "ws2_32.lib")

#define PORT 8888
#define BUFFER_SIZE 1024

int main() {
    printf("server start---\n");
    WSADATA wsaData;
    int server_socket;
    struct sockaddr_in server_addr, client_addr;
    int client_addr_len = sizeof(client_addr);
    char buffer[BUFFER_SIZE];

    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsaData)!= 0) {
        perror("WSAStartup failed");
        return 1;
    }

    // 创建UDP套接字
    if ((server_socket = socket(AF_INET, SOCK_DGRAM, 0)) == INVALID_SOCKET) {
        perror("Socket creation failed");
        WSACleanup();
        return 1;
    }

    // 初始化服务器地址结构
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = INADDR_ANY;

    // 绑定套接字到指定地址和端口
    if (bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == SOCKET_ERROR) {
        perror("Bind failed");
        closesocket(server_socket);
        WSACleanup();
        return 1;
    }
    printf("Server is waiting for incoming messages...\n");
    while (1) {
        // 接收来自客户端的数据
        int recv_len = recvfrom(server_socket, buffer, BUFFER_SIZE - 1, 0,
                                (struct sockaddr *)&client_addr, &client_addr_len);
        if (recv_len == SOCKET_ERROR) {
            perror("Receive failed");
            continue;
        }
        buffer[recv_len] = '\0';

        printf("Received message from client: %s", buffer);

        // 发送响应给客户端---执行实际操作数据处理
        const char *response = "Message received successfully";
        int send_len = sendto(server_socket, response, strlen(response), 0,
                              (struct sockaddr *)&client_addr, client_addr_len);
        if (send_len == SOCKET_ERROR) {
            perror("Send failed");
            continue;
        }
    }

    closesocket(server_socket);
    WSACleanup();
    return 0;
}
